package cn.yangliu.kindeditor.web;

import cn.yangliu.kindeditor.comparator.NameComparator;
import cn.yangliu.kindeditor.comparator.SizeComparator;
import cn.yangliu.kindeditor.comparator.TypeComparator;
import cn.yangliu.kindeditor.config.KindEditorConfig;
import com.alibaba.fastjson.JSONObject;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * 作者 杨柳
 * 时间 2017-09-24 14:23
 * 描述
 */
public class FileManagerServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        todo(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        todo(request, response);
    }

    @Override
    protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        todo(request, response);
    }

    @Override
    protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        todo(request, response);
    }

    //图片扩展名
    private static String[] fileTypes = new String[]{"gif", "jpg", "jpeg", "png", "bmp"};
    private static String[] dirs = new String[]{"image", "flash", "media", "file"};


    private void todo(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        //文件保存目录路径
        String savePath = KindEditorConfig.getOtherConfigMap().get("globalSavePathPreffix");
        if (savePath == null || "".equals(savePath)) {
            savePath = request.getServletContext().getRealPath("/") + "attached/";
        }else {
            if (!savePath.endsWith("/")) {
                savePath += "/";
            }
        }
        //文件保存目录URL
        String saveUrl = KindEditorConfig.getOtherConfigMap().get("globalUrlPreffix");
        if (saveUrl == null || "".equals(saveUrl)) {
            saveUrl = request.getContextPath() + "/attached/";
        }else {
            if (!saveUrl.endsWith("/")) {
                saveUrl += "/";
            }
        }

        String dirName = request.getParameter("dir");
        if (dirName != null) {
            if (!Arrays.asList(dirs).contains(dirName)) {
                out.println("Invalid Directory name.");
                return;
            }
            savePath += dirName + "/";
            saveUrl += dirName + "/";
            File saveDirFile = new File(savePath);
            if (!saveDirFile.exists()) {
                saveDirFile.mkdirs();
            }
        }
//根据path参数，设置各路径和URL
        String path = request.getParameter("path") != null ? request.getParameter("path") : "";
        String currentPath = savePath + path;
        String currentUrl = saveUrl + path;
        String currentDirPath = path;
        String moveupDirPath = "";
        if (!"".equals(path)) {
            String str = currentDirPath.substring(0, currentDirPath.length() - 1);
            moveupDirPath = str.lastIndexOf("/") >= 0 ? str.substring(0, str.lastIndexOf("/") + 1) : "";
        }

//排序形式，name or size or type
        String order = request.getParameter("order") != null ? request.getParameter("order").toLowerCase() : "name";

//不允许使用..移动到上一级目录
        if (path.indexOf("..") >= 0) {
            out.println("Access is not allowed.");
            return;
        }
//最后一个字符不是/
        if (!"".equals(path) && !path.endsWith("/")) {
            out.println("Parameter is not valid.");
            return;
        }
//目录不存在或不是目录
        File currentPathFile = new File(currentPath);
        if (!currentPathFile.isDirectory()) {
            out.println("Directory does not exist.");
            return;
        }

//遍历目录取的文件信息
        List<Hashtable> fileList = new ArrayList<Hashtable>();
        if (currentPathFile.listFiles() != null) {
            for (File file : currentPathFile.listFiles()) {
                Hashtable<String, Object> hash = new Hashtable<String, Object>();
                String fileName = file.getName();
                if (file.isDirectory()) {
                    hash.put("is_dir", true);
                    hash.put("has_file", (file.listFiles() != null));
                    hash.put("filesize", 0L);
                    hash.put("is_photo", false);
                    hash.put("filetype", "");
                } else if (file.isFile()) {
                    String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                    hash.put("is_dir", false);
                    hash.put("has_file", false);
                    hash.put("filesize", file.length());
                    hash.put("is_photo", Arrays.<String>asList(fileTypes).contains(fileExt));
                    hash.put("filetype", fileExt);
                }
                hash.put("filename", fileName);
                hash.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
                fileList.add(hash);
            }
        }

        if ("size".equals(order)) {
            Collections.sort(fileList, new SizeComparator());
        } else if ("type".equals(order)) {
            Collections.sort(fileList, new TypeComparator());
        } else {
            Collections.sort(fileList, new NameComparator());
        }
        JSONObject result = new JSONObject();
        result.put("moveup_dir_path", moveupDirPath);
        result.put("current_dir_path", currentDirPath);
        result.put("current_url", currentUrl);
        result.put("total_count", fileList.size());
        result.put("file_list", fileList);

        response.setContentType("application/json; charset=UTF-8");
        out.println(result.toJSONString());

        out.close();

    }


}
